Rht/lida.] GASTROPODA. 777 



basal Up moderately convex. ( 'n!i;t,,r!/<i subvertical, arcuate. Inner 

 lip slightly callous, reflexecl toward the umbilicus, but not covering 

 it ; parietal wall with a very thin "-laze. Umbilicus rather narrow, 

 slightly infundibular, deep. 



Diameter Maj., 23 mm. ; min.. 16 mm. : height, 10 mm. 



Animal. Foot broad, flattened, and acutely pointed behind, the 

 margin minutely crenulated, tail extending beyond the shell ; no 

 caudal gland nor locomotive disc. Mantle subcentral. just reflexed 

 over the peristome. Eye-peduncles separated at their bases ; they 

 and the tentacles long, stout, and cylindrical. Head, peduncles, and 

 anterior part of the foot dark grey, closely reticulated with blue-black 

 lines, and with scattered minute white specks ; sole of the foot dark- 

 coloured ; mantle under the shell ]>;i!< i yellow, with blotches of bhie- 

 black. (Mutton.) 



Dentition (Button, T.N.Z.I., xvi. 167, pi. 10, f. Q). Transverse 

 rows of teeth forming an acute angle. Formula 18+0+ 18 ; in speci- 

 mens from Balclutha 14 + 0+14. Teeth robust, aculeate, increasing 

 from the centre up to the 17th, which is the largest and has an angular 

 ridge. 



lype in the Canterbury Museum, Christchurch. 



Hob. South Island : Greyniouth, type (Helms) ; Capleston, near 

 Reefton (Cavell) ; Balclutha (Captain Hutton). 



Genus 2. PARYPHANTA, Albers, 1850. 



/''tryphanta, Albers, ' ; Die Heliceen," 1850, 129. Type : Nanina Busby i, 

 Gray. Paryphanta, W. T. L. Travers, " Notes on the Larger Species of 

 Paryphanta in New Zealand," T.N.Z.I., xxvii, 224. 



Animal having the body much wrinkled, the foot capable of grM 

 extension laterally, rounded in front, pointed posteriorly, without 

 caudal mucous pore. There are 110 mantle-lobes, but 2 small neck- 

 lappets, the left in 2 lobes, one next the respiratory orifice, the other 

 on the posterior side. Ommatophores long and rather slender, the 

 eyes on the dorsal side some distance back from the terminal bulb. 

 Mouth and buccal mass very muscular, the radula long and narrow. 

 Radula with aculeate teeth, 29 to 135 in a transverse row ; a central 

 tooth is usually present. Reproductive organs simple. All the New 

 Zealand species are oviparous, the eggs calcareous. Animal car- 

 nivorous. 



Shell umbilicated, rarely perforated, the epidermis shining, some- 

 times coriaceous ; spire flattish ; suture distinct ; whorls 4 to 5, 

 rapidly increasing, the last rounded, deflexed in front ; aperture 

 lunate to elongately oval ; peristome acute, sometimes enveloped by 

 the epidermis, which usually extends beyond the peristome ; columella 

 arcuate, shortly reflexed above. 



Distribution. North and South Islands of New Zealand (six species). 

 Tasmania (one species), Victoria (one species), Louisiade Archipelago 

 (one species), British New Guinea (two species). 



